Abstract
Light emission associated with the 5D0 → 7F3 electronic transition in Eu3+ ions dispersed within a mesoporous structure of Al2O3 is reported. It lies in a long band centred at 666 nm with an integrated intensity about 1.75 times that of the more common 5D0 → 7F2 transition at 619 nm. Usually, the 5D0 → 7F3 transition is an electric–dipole, quadruple, or magnetic–dipole forbidden transition. The symmetrically shaped band has a width of 50 nm, which can be compared to values of 20 nm or less found for the same transition in non-porous samples. A model is proposed to explain the results.
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